366 University of California Publications in Geology [Vol. 12 



Comparative Foot Measurements 



Pliauchenia merriami, n. sp. No. 23484 Procamelus, n. sp. Caraelops 



No. 23483 Subform A no. 23392 hesternus 





Fore 

 foot 



Hind 

 foot 



Foot (?) 





Fore Hind 

 foot foot 



Length of phalanx 1 



130 mm. 



107 mm. 



110 mm. alio mm. 



113 mm. 



133 mm. 



119 mm. 



Diameter of proximal 

















end of phalanx l.... 



49 



48 



46 



45 



40 



47.5 



48.5 



Least diameter of 

















shaft of phalanx 1 



29 



32 



27.5 



27.5 



18 







Length of phalanx 2 



78 



72 



64 



60 





fin 



OD.O 



Diameter of proximal 

















end of phalanx 2.... 



46 



42 



36 



36 





34.5 



38 



Length of phalanx 3 



36 



36 



25 











Dorsoventral diam- 

















eter of phalanx 3 



37 



a36 



20.5 











Diameter of greatest 

















metapodial trochlea 



52 





45 







51 







Pliauchenia 



Alticamelus 











gigas 

 Matthew 





procerus 

 Matthew 











Length of phalanx 1 



128 





108 



98 









Diameter of proximal 

















end of phalanx 1.... 



52 





36 



33 









a, approximate. 



h, difference due to crushing? 



PLIAUCHENIA, sp. A 



Material. — Phalanges of the fore and hind feet, carpus and jiortions of meta- 

 podials, radius, humerus, etc., of type individual, Univ. Calif. Coll. Vert. Pal. 

 no. 23484 (pi. 47, fig. 5; pi. 48, fig. 10, text figs. 72, 926-92c), and a referred 

 radius, Univ. Calif. Coll. Vert. Pal. no. 23486 (pi. 47, fig. 3). 

 *, . ^ , 



Description. — The specimen indicates the presence of a species 

 somewhat smaller than P. merriami, and of markedly different propor- 

 tions, as shown by the scale drawings of the radius and humerus joint 

 (pi. 48, figs. 10. 11), of the trochlea (fig. 92c), of the carpus (pi. 47, 

 fig. 5), and of the i^halanges (fig. 72). The distal portion of the 

 referred complete radius (no. 23486, pi. 47, fig. 3) is of the same size 

 as that of a radial section associated in the nodular remains of the 

 above specimen. The bone is nearly as long as that of the modern 

 dromedary (510 mm. versus 580 mm., Univ. Calif. Coll. Vert. Pal. 

 specimen 22843). It is much larger than in Procamelus rohustus 

 (averaging in length 379 mm. to 464 mm.) , and is shorter than a radius 

 referred to Pliauchenia gigas (measuring 759 mm.). 



